[newlib-cygwin] Cygwin: avoid GCC 10 error with -Werror=narrowing

[Jon TURNEY]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=129c9844a6c40d5dee658151c2ff2c461a5a1365

commit 129c9844a6c40d5dee658151c2ff2c461a5a1365
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Sat Sep 19 15:55:09 2020 +0100

    Cygwin: avoid GCC 10 error with -Werror=narrowing
    
    ../../../../src/winsup/cygwin/fhandler_console.cc: In member function 'const unsigned char* fhandler_console::write_normal(const unsigned char*, const unsigned char*)':
    ../../../../src/winsup/cygwin/fhandler_console.cc:2782:8: error: narrowing conversion of '-2' from 'int' to 'long unsigned int' [-Wnarrowing]
    ../../../../src/winsup/cygwin/fhandler_console.cc:2786:8: error: narrowing conversion of '-1' from 'int' to 'long unsigned int' [-Wnarrowing]
    ../../../../src/winsup/cygwin/fhandler_console.cc:2836:8: error: narrowing conversion of '-2' from 'int' to 'long unsigned int' [-Wnarrowing]
    ../../../../src/winsup/cygwin/fhandler_console.cc:2840:8: error: narrowing conversion of '-1' from 'int' to 'long unsigned int' [-Wnarrowing]
    
    A mbtowc_p function returns an int, so that seems the correct type to use here.

Diff:
---
 winsup/cygwin/fhandler_console.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/fhandler_console.cc b/winsup/cygwin/fhandler_console.cc
index 33e40a9f9..41cac37e6 100644
--- a/winsup/cygwin/fhandler_console.cc
+++ b/winsup/cygwin/fhandler_console.cc
@@ -2759,7 +2759,7 @@ fhandler_console::write_normal (const unsigned char *src,
   DWORD done;
   DWORD buf_len;
   const unsigned char *found = src;
-  size_t ret;
+  int ret;
   mbstate_t ps;
   mbtowc_p f_mbtowc;
 
@@ -2938,7 +2938,7 @@ do_print:
 		{
 		  ret = __utf8_mbtowc (_REENT, NULL, (const char *) found + 1,
 				       end - found - 1, &ps);
-		  if (ret != (size_t) -1)
+		  if (ret != -1)
 		    while (ret-- > 0)
 		      {
 			WCHAR w = *(found + 1);